23898021 has 16 divisors (see below), whose sum is σ = 36562944. Its totient is φ = 13600944.

The previous prime is 23898019. The next prime is 23898023. The reversal of 23898021 is 12089832.

It is an interprime number because it is at equal distance from previous prime (23898019) and next prime (23898023).

It is not a de Polignac number, because 23898021 - 2¹ = 23898019 is a prime.

It is a super-2 number, since 2×23898021² = 1142230815432882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23898023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3360 + ... + 7686.

It is an arithmetic number, because the mean of its divisors is an integer number (2285184).

Almost surely, 2^23898021 is an apocalyptic number.

23898021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23898021 is a deficient number, since it is larger than the sum of its proper divisors (12664923).

23898021 is a wasteful number, since it uses less digits than its factorization.

23898021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 23898021 is about 4888.5602174874. The cubic root of 23898021 is about 288.0407807800.

The spelling of 23898021 in words is "twenty-three million, eight hundred ninety-eight thousand, twenty-one".